由于需要用到utf8mb4，之前是utf8现在给改成utf8mb4
查看当前环境
SHOW VARIABLES WHERE Variable_name LIKE 'character\_set\_%' OR Variable_name LIKE 'collation%';
+--------------------------+--------------------+
| Variable_name | Value |
+--------------------------+--------------------+
| character_set_client | latin1 |
| character_set_connection | latin1 |
| character_set_database | utf8mb4 |
| character_set_filesystem | binary |
| character_set_results | latin1 |
| character_set_server | utf8mb4 |
| character_set_system | utf8 |
| collation_connection | latin1_swedish_ci |
| collation_database | utf8mb4_general_ci |
| collation_server | utf8mb4_general_ci |
+--------------------------+--------------------+
打开MySQL的配置文件，将字符集的配置修改成如下：
[client]
default-character-set = utf8mb4 [mysql]
default-character-set = utf8mb4 [mysqld]
character-set-client-handshake = FALSE
character-set-server = utf8mb4
collation-server = utf8mb4_general_ciinit_connect='SET NAMES utf8mb4'
修改后
root@localhost:(none)>SHOW VARIABLES WHERE Variable_name LIKE 'character\_set\_%' OR Variable_name LIKE 'collation%';
+--------------------------+--------------------+
| Variable_name | Value |
+--------------------------+--------------------+
| character_set_client | utf8mb4 |
| character_set_connection | utf8mb4 |
| character_set_database | utf8mb4 |
| character_set_filesystem | binary |
| character_set_results | utf8mb4 |
| character_set_server | utf8mb4 |
| character_set_system | utf8 |
| collation_connection | utf8mb4_unicode_ci |
| collation_database | utf8mb4_unicode_ci |
| collation_server | utf8mb4_unicode_ci |
+--------------------------+--------------------+ root@localhost:(none)>\s;
--------------
mysql Ver 14.14 Distrib 5.1.73, for redhat-linux-gnu (x86_64) using readline 5.1 Connection id: 61
Current database:
Current user: root@localhost
SSL: Not in use
Current pager: stdout
Using outfile: ''
Using delimiter: ;
Server version: 5.5.36-log Source distribution
Protocol version: 10
Connection: Localhost via UNIX socket
Server characterset: utf8mb4
Db characterset: utf8mb4
Client characterset: utf8mb4
Conn. characterset: utf8mb4
UNIX socket: /tmp/mysql.sock
Uptime: 3 min 22 sec
修改后发现连接报错
mysql: Character set 'utf8mb4' is not a compiled character set and is not specified in the '/usr/share/mysql/charsets/Index.xml' file
修改/usr/share/mysql/charsets/Index.xml
修改前
<charset name="utf8">
<family>Unicode</family>
<description>UTF-8 Unicode</description>
<alias>utf-8</alias>
<collation name="utf8_general_ci" id="33">
<flag>primary</flag>
<flag>compiled</flag>
</collation>
<collation name="utf8_bin" id="83">
<flag>binary</flag>
<flag>compiled</flag>
</collation>
</charset>
修改后
<charset name="utf8mb4">
<family>Unicode</family>
<description>UTF-8 Unicode</description>
<alias>utf-8</alias>
<collation name="utf8_general_ci" id="33">
<flag>primary</flag>
<flag>compiled</flag>
</collation>
<collation name="utf8_bin" id="83">
<flag>binary</flag>
<flag>compiled</flag>
</collation>
</charset>